[Red Badger]

They tell us the earth was covered in a “mile thick” layer of ice.

Unless the ice cap was already nearly melted, the size of a rock or other body required to produce any significant melting or breakup would have to be huge..............

[Vermont Lt]

And because there was ice up there a mile thick, there would be little surface evidence.

Its a perfect theory! (Kidding on that last sentence.)